Tony,
I use extra 2 litre plastic bottles that I bought from Industrial Paint and Plastics for my reservoirs. I just pre-fill them and swap them out when it comes time to refill. I haven't experienced the brown goo..?
I use either a Kalkwasser stirrer for my top up depending on PH levels, or straight R/O water.
That mixing procedure does sound like a PITR.
Mitch
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